Black Magic Cake Recipe (Best Chocolate Cake Ever!) – It's a chocolate lovers dream. Simple and straightforward, this is one of those recipes that everyone will love. Coffee enhances the chocolate flavor and buttermilk helps make the cake moist. We don't use margarine often for frosting, but this chocolate one is so good it made a believer out of us. It's perfect on top of the chocolaty cake. Be sure to have plenty of milk on hand.